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PRINCIPAL ACCOUNTING POLICIES - Dividends (Details) - CNY (¥) ¥ in Billions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
PRINCIPAL ACCOUNTING POLICIES |  |  |
Restricted net assets of company's PRC subsidiaries and VIEs not distributable in form of dividends to parent | ¥ 6.2 |  |
Accumulated profit of subsidiaries in PRC distributable in form of dividends to parent | ¥ 32.0 | ¥ 28.4 | ¥ 25.8
Withholding tax rate for dividends distributed by foreign invested enterprise to their immediate holding companies outside mainland china (as a percent) | 10.00% |  |
Dividends declared and paid | ¥ 0.0 | ¥ 0.0 | ¥ 0.0

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